Rebound check



Jan. 31, 1928.

' R. H. HAssLER REBOUND CHECK Filed Feb. 14, 1925 3 Sheets-Sheet 1 W 0mm N y m .m w m m T M N ww mm um@ 1 mm ,m eg mm QN @Obert fifi/agde@ Bg f4? TTU/@NEX Jan, 31, 1928. 1,657,503

R. HAssLER REBOUND CHECK Filed Feb. 14, 1925 3 Sheets-Sheet R. H. HASSLER REBOUND CHECK Jan. 31, 1928.

Filed Feb. 14, 1925 3 Sheets-Sheet 3 Patented Jan. 31, 1928.

UNITED STATES ROBERT I-I. HASSLER, OF INDIANAPOLIS,

INDIANA, ASSIGNOR, BY MESNE ASSIGN- MENTS, T0 HASSLER MANUFACTURING C0., IN C., 0F INDIANAPOLIS, INDIANA,

CORPORATION or DELAWARE.

REBOUND CHECK.

Application led February (5o-pending application filed December 27 1924, Serial No, 758,453, by Robert H; Hassler, entitled Rebound check, now Patent No. 1,586,799, granted June 1, 1926.

My invention has for its object to produce a simple, compact, efficient, and durable rebound check which is adapted to be connected between two relatively movable members of an `automotive vehicle chassis, and which will effectively retard the sudden recoil action of the main suspension springs after they have been compressed. The principal object of this invention is to provide a rebound check of the one-way acting type which can be mounted upon a vehicle chassis and connected by a flexible strap to the axle so that said vehicle will be free to move downwardly as the springs compress. When rebounding from the compressed position, the flexible strap is drawn taut and cooperates with the friction device thereby preventing a rapid upward movement of the spring suspended parts, becausea predetermined resistance set up by the friction device must first be overcome.

Another object of the invention is to provide a construction wherein the force or strain to which the rebound check is `subjected, is exerted upon the friction creating members.

Still another object of the invention is to provide a novel fioating type thrust bearing which is adapted to transmit the pressure from the pressure exerting means to the friction cup.

A still further object of the invention is to provide a journal or hub support which is formed integral with the supportingmember and which is adapted to provide an adjustment for changing the pull characteristics of the absorber.

Still a further object of the invention is to provide a construction in which means are provided for anchoring the flexible strap to the rebound check drum.

Another object of the invention is to provide a "drum or casing which is simple in construction and inexpensive to manufacture,

y and which is adapted to permit the flexible y connected thereto.

14, 1925. Serial No. 9,197.

strap element to wind on the external surface thereof. l

A still further object of the invention is to provide a hub construction, provided with a plurality of slots, anyone of which affords means for anchoring the inner extremity of l the spiral spring.

It is also the object of the invention to provide a rebound check which has parts of simple construction; which are strong and durable; which will not easily get out of order; which can be readily applied to vehicles already in use, or furnished as a regular part of the initial equipment thereof; and which can be manufactured at a normal cost and still operate etliciently to obtain thedesired restraining epect.

The invention may be briefly summarized as consisting of certain novel details of construction, combinations and arrangements of parts which will be described in the specifications and pointed out in the appended claims. y

In the accompanying drawings, forming a part of the specifications, Figure 1 illustrates a side .elevation of the rebound check assembly Wlth fragments broken away, to show some of the working parts therein. Fig. 2

is a cross sectional view of Fig. 1 shownmounted on the frame portion of a vehicle chassis and is taken approximately on the line 2-2 in Fig. 1.A Figs. 3 to 12 inclusive are drawnl at a reduced scale; Fig. 3 being a cross-sectional view of the oscillating drum, taken on the line 33 in Fig.` 4, and illus` trates the arrangement of some of the parts p Fig. 4 is a side elevation vof Fig. 3. Fig. 5 is a side velevation of the hub support, and Fig. 6 is a crosssectional view taken on the line 6-6 in Fig.

5. Fig. 7 is a side elevation of the locking washer and Fig. S an end elevation thereof. Fig. 9 is a side elevation of the rebound check spring, and Fig. 10 an endelevation thereof. Fig. 11 is a side elevation of the pressure plate. Fig. 12 is a side elevation of the friction disk. Fig. 13 is a Jfull-size, side elevation ofthe flexible strap anchor plate, and Fig. 14 an end elevation thereof. Fig. 15 is a full size, sectional view of the device showing a modified form thereof.

Referring to the drawings, 10 represents a hub support, by means of which the rebound check is mounted on the frame 11, and secured thereto by means olf a securing bolt 13 and a nut 15. The securing bolt i3 has provided on its body external screw threads which engage with internal screw threads in a boss portion 1()n formed on the hub support 10. 10b represents an outwardly disposed lug or stop which is adapted to engage against the lower flange of the frame" member 11 and thereby prevents independent rotation of the rebound checlr unit when secured in position on the frame. l()c represents an expanded circular flanged portion which forms a cover for one side of `the de vice, and upon which the friction disk 1-14A is non-rotatably mounted. The `friction disk is preferably made of a hardwood, inapreg-` nated with a lubricating compound. The flanged portion 1()c is provided with a plu rality fof apertures 10d into which are inserted a plu 1ality of dowel pins 18., these beingr preferably riveted in place. These pins are provided with enlarged portions on one extremity, indicated by the ordinal 18, which are tightly fitted to and inserted in a series of apertures 1i.LL provided in the friction ring 14. These pins when inserted in place prevent independent rotation of the friction ring let with respect. to the hub support 10. 2O represents a. conical friction cup which has provided therein a pair of conical friction surfaces; 20"L indicating the small diameter surface and 20b the large diameter surface. It will be observed that the small conical surface 20a is inverted with respectto the large surface 20". They are adapted to snugly engage with mating conical surfaces which are provided on the friction ring 14. The friction cupA 20 is nonrotatably mounted on a. pair of cup shaped members 2fl and 25 respectively by means of a plurality of rivets 27. '.llheineinbers 2li and 25 are provided with flat circular disk portions 24a and 25 respectivelyJ each of which blend into outwardly disposed flanges 241 and 251 respectively. The-disk portionsv are arranged adjacent one another and are secured together, in the present instance, by a plurality of rivets 26 and 2T the rivets 27 also serving` to attach the friction rup in operative position on member 24. The disks 2li and 25"L have provided in their central portions large apertures 24C and 25c Vrespectively. i

28 represents a flexible beltor strap which operates on the external surface ofthe drum or pulley portion which is fornieddue to the relative position of the flanges 24 and .25". Depressions er pocket portions 24" and 25d are formed in the members 24 and '25 respectively, which provide means into which the flexible strap can be anchored. A. strap anchor plate 30 is held securely thereinby means of rivets 31-31 which are inserted into apertures 30a-30 in the anchor plate 3() and in mating apertures in the pockets 24H1 and 25d respectively. The flexible strap at one extremity is secured to the anchor plate 30 by means of a plurality of rivets 355 and a clamping plate 341i.

32 represents a spiral spring which is anchored at its outer cxtren'nty to a headed pin 35; the pin being securely anchored to the flange 25h. A flat circular washer 3S reinforces the flange 25. A lnedcterinincd number of the smaller convolutions of the spring are pushed outwardly when forming the spring and before tempering, which convolutions are illustrated in Fig. 1t); and When they are forced into a flattened position, illustrated in Fig. 2, a resistance or an end pressure is exerted by the spring. This end pressure is utilized for the purpose of forcing the friction cup 20 in frictional engagement with the ring 14.

10g represents a cylindrical hub portion which is horizontally disposed from the central flange or disk portion 10 of the supporting member 10. The hub is provided with a plurality of grooves 10e. t() represents a cap screw which engages in a hollow threaded portion 10r provided iu the hori mental axis of the hub 10g.

t2 represents a pressure plate which is: interposed between the central pressunI ero citing coils of the sprinzgl 32 and the head of the cap screw at). It has a transversely disposed ear 42 which is inserted in one of the grooves and thereby prevents the washer from rotating therein, due to the rotary action of the spiral spring.

fill .represents a thrust bearing which I have provided to be interposed between the friction cup 20 and the pressure exerting portion of the spring 32. The thrust hear ing is preferably made of a hard wood whii'h is impregnatel with a. lulnicatinn compouml rendering' it self-lubricating. washer 46 is interposed between the thrust bearinglr and the piessure exerting coils of the spring 32 which protects the adjacent faire of the thrust bearing'. To prevent independent rotation of the washer it on the hub 10g, it is provided with a plurality of inwardly disposed lugs or keys riti which engage with key-ways 1()c in the hub Ulf- The spring is provided with an inwardly disposed lipped portion 32 at its inner extremity, Which engages in one of theY `slots .lllL al' the hub 10g. The outer extremity of: the spring 32 is anchored so as to rotate with the drum; this is effected by providing an aporture `82" in the spring, which permits the spring to be slipped `over the liead of pin 3:7.

To exclude road grit, and foreign particles, I have provided a cup shaped cover i7 which fits snugly on the circular flanged portion 25" of the member 25. The rover A `dat circular ltlb Ill)

is provided with an annular bead 46' which lmates with and snaps into a groove Qf formed in the flange 251.

rlhe torsion spring is so disposed that it tends constantly to wind up the strap on the drum. Therefore, when the main i springs of the vehicle, to which the device is attached are compressed, the slaclr of 'the strap is taken up by the rebound check mechan sm; the torsion spring being made of suilicient pulling capacity and adjust.

ability to `m'eicome 'the frictional resistance on. llfhen eizpansionor rebound action of titl the spring occurs, the .strap which has been drawn taut on the compression stroke, immediately pulls upon and rotates the rcbound'checlr drum, the speed of which is retarded by means of the frictional drag created by the friction members. The amount of frictional resistance set up by these friction members depends upon the predetermined compressive strength of the central coils of the .spring rllhe construction is such that the radial loads or strains, exerted bythe device, are carried directlyby the friction members l-/l and instead of on a' horizontally disposed central hub which is common to most rebound checks no,r in use.

It has been found that if only the large diameter friction surface is used, that the drum 2O tends to wabble or rotate out of true, with respect to vertical, when the strap exerts a sudden pull, but with my novel construction, such tendencies are obviated and the drum oscillates on a true plane at right angles to its horizontal axis. In a device of this nature, I have found it desirable to interpose the thrust bearing 44 between the pressure exerting portion of the spring and the friction cupv 20. This thrust bearing` is, in the present instance, permitted to float, as the arrangement of the parts is not such as to cause any positive predetermined movement with respect to `the adjacent parts.

rlfhe central aperture in the thrust bearing is large enough in diameter so as to provide clearance between the hub l0=T and the bearing. This construction relieves the hub of any vertical load being transmitted directly from the bearing. This clearance is adi.fantagecus as it eliminates the possibility of the p i its becoming loose due to wear either on the hub or thrust bearing. rIhe thrust bearing not only distributes the` spring pressure equally on the periphery of, and at right angles to, the taper face of both the 'thrust bearing 4l, and 'the adjacent tapu' face of the friction cup 20, but also provides a construction which automatically takes upl any `Wear that may occur on the taper faces or on the. perpendicular face of the thrust bearing adjacent the pressure plate 46..

In the modification shown in Fig.` l5, the central aperture in the thrust bearing li-l is fitted to the hub. and is adapted to take the vertical load as well` as the horizontal load `or end pressure imparted from `the pressure exerting coils of the spring` 32.

It will be observed from the illustrations that the cup-shaped members 2d and 25, the friction cup Q0, thestrap anchor 30, and the circular washers 4t2 and d6, are sodesigned that they can be inade,ifdesired, of pressed steel stainpings. The cup shaped members 2l and 25 have flanges `so shaped and so disposed, that when securcdtogether, the outer cylindrical surface forms a crowned pulley or ,drum for the strapfto wind on.

Both the thrust bearing and the friction ring are preferably made of hard Wood iinpregnated with a special lubricating com* pound. rlhis combination of wood and ulubricant has been found to give excellent results in preserving the wearing surfaces of both the friction ring and thrust bearing. lt is thus seen that the invention provides a simple, compact and durable construction requiring` but comparatively few parts; one which will not easily get out of order; one which can be made of pressed steel. stampings; and one in which any wear that might occur either on the friction ring or thrust bearing will be automatically compensated for.

' lllhile I have illustrated and described with particularity, one preferred and one modified form of my invention, I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come within the terms employed in the denition of my invention constituting the appended claims. l

What I claim is:

l. In a. rebound check, a friction element, an oscillating drum frictionally engaged with said element, and means for oscillatingl said drum, said oscillating drum comprising a pair of discs secured together having outwardly disposed cylindrical flanges.

2. In a rebound check, a friction element, an oscillating drum frictionally engaged with said element, and means for oscillating said drum, said oscillating drum comprising a pair of members, each member consisting of a disc portion and a flange, the disc portions of the two members being rigidly secured together and the flanges of the two members extending oppositely and outwardly from the disc portions.

3. In a rebound check, a friction element, an oscillating drum frictionally engaged With said element, and means for oscillating said drum, said oscillating drum comprising a pair of membersD elch member consisting of a disc portion and a flange, the disc portions of the two members being :rigidly secured together and the flanges of the two members extending oppositely `and outwardly from the disc portions, the inner portions of the flanges being larger in diameter' than the outward portions thereof.

- 4. In a4 rebound check, a friction element, an oscillating drum trictionally engaged with said element, flexible means for oscillating said drum, said drum comprising a pair of members, each member consisting of a disc portion and a flange, the disc portions of the two members being rigidly secured together, and an anchor plate interposed between .said disc portions for securing the flexible means thereto- 5. In a rebound check, a friction element1 a pair of discs having oppositely disposed cylindrical flanges, flexible means for oscillating said flanged discs. and oppositely disposed angle plates interposed between said flanged dises for securing the flexible means thereto.

6. In a rebound check, a friction element, a drum comprising a pair of discs having oppositely disposed cylindrical flanges, ilexible means for oscillating said drum, and an anchor plate having one portion thereof extending intermediate said discs and rigid'- ly secured thereto, and `another portion thereot lying substantially flush with said flanges and secured to said llexible means.

7. In a rebound check, a friction element, a pair of discs, means :tor oscillating said discs, a friction cup trictionally engaged with said element, and means tor riwidly curing said cup to one of the said discs.

8. In a rebound cheek, a friction element, an oscillating drum, said oscillating drum comprising two members, leach member consisting of a disc portion and a llange portion, a friction eu frictionally engaged with said element, anc means i'or securing said cup to the disc portion ot one ot' the two drum members.

9. In a rebound check, a friction element, an oscillating drum, flexible means for oscillating said drum, said drum comprising a pair of members, each member consisting of a disc portion of ay flange, the disc portions of the two members being rigidly secured together, a friction cup :trictionally engaged with said element and rigidly secured to said drum, and an `anchor plate interposed between said `disc portions for securing the lexible means thereto.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 30th day et January, A. I). one thousand nine hundred and twenty live.

ROBERT H. HASSLER. 

